EP1291332A2 - Vorrichtung zur Kombinierung einer Flüssigkeit mit einer optischen Faser oder mit optischem Faserbündel - Google Patents

Vorrichtung zur Kombinierung einer Flüssigkeit mit einer optischen Faser oder mit optischem Faserbündel Download PDF

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Publication number
EP1291332A2
EP1291332A2 EP02017827A EP02017827A EP1291332A2 EP 1291332 A2 EP1291332 A2 EP 1291332A2 EP 02017827 A EP02017827 A EP 02017827A EP 02017827 A EP02017827 A EP 02017827A EP 1291332 A2 EP1291332 A2 EP 1291332A2
Authority
EP
European Patent Office
Prior art keywords
die
fluid
optical fiber
exit
entrance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02017827A
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English (en)
French (fr)
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EP1291332A3 (de
EP1291332B1 (de
Inventor
Philip Sturman Jr.
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Draka Comteq BV
Original Assignee
Alcatel SA
Nokia Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alcatel SA, Nokia Inc filed Critical Alcatel SA
Publication of EP1291332A2 publication Critical patent/EP1291332A2/de
Publication of EP1291332A3 publication Critical patent/EP1291332A3/de
Application granted granted Critical
Publication of EP1291332B1 publication Critical patent/EP1291332B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
    • C03C25/10—Coating
    • C03C25/12—General methods of coating; Devices therefor
    • C03C25/18—Extrusion

Definitions

  • the present invention generally relates to the field of fiber optic cables, in particular the present invention is directed to a method and apparatus for applying water barrier gels to optical fibers or fiber bundles at high speeds.
  • Optical fibers are very small diameter glass strands which are capable of transmitting an optical signal over great distances, at high speeds, and with extremely low signal loss as compared to standard wire or cable networks.
  • Optical fiber has found increasingly widespread application and currently constitutes the backbone of the worldwide telecommunication network. Because of this development, there has been a growing need for better quality optical fibers with a decrease in production time and costs, while ensuring adequate material strength for continued operation in increasingly harsh conditions.
  • An important aspect for making better optical fibers is the reduction of structural faults or impurities in the protective coatings applied to the optical fiber during manufacture.
  • optical fibers are manufactured from relatively large diameter glass preforms.
  • Fiber optic preforms are generally made with three concentric glass layers.
  • the inner layer, or core is made of a very high quality, high purity SiO 2 glass, which for example, may be about 5 mm in diameter.
  • This high purity core is the portion of the optical fiber in which the optical data is transmitted.
  • Concentrically positioned around the high purity core is a second layer of glass, or cladding, with a lower index of refraction then the inner core, and generally is less pure. The difference in refraction indices between the core and cladding allows the optical signals in the core to be continuously reflected back into the core as they travel along the fiber.
  • optical fiber cable The combination of the core and cladding layers is often referred to as the "primary preform.”
  • the optical fiber is then formed by heating and softening a portion of the preform, and rapidly drawing the softened portion with specialized equipment.
  • the length of the drawn optical fiber is typically several thousands of times the length of the primary preform.
  • Optical fibers intended for manufacture of telecommunications cables are typically coated with one or more polymer layers.
  • the polymers provide mechanical protection of the fiber surface, and are colored for identification purposes.
  • the coated optical fibers, singly or in groups, are typically covered with one or more of a number of jackets that provide structural support and environmental protections.
  • the aggregate of the optical fiber, jackets, and additional integrated mechanical supports, is typically referred to as an optical fiber cable.
  • the hydrophobic fluid is typically a gel. Gels tend to flow when mechanically stressed, but tend to remain static when under a low mechanical load.
  • Known methods for applying gel to fibers include drawing the fibers through a reservoir filled with gel so that the fibers are coated.
  • the use of such a method often results in an inconsistent coating on the fibers due to air entrapped air.
  • gel applicators have been developed, such as the device disclosed in Griser et al. U.S. Pat. No. 5,395,557, which attempts to reduce air entrapment by using a reservoir filled with pressurized gel.
  • This device includes a housing having a cavity through which a plurality of separated optical fibers are fed. Gel is provided to the cavity from a gel reservoir via a pump. The optical fibers are then drawn through the gel so that the fibers are coated with the gel.
  • the gel is provided under pressure in an attempt to reduce air gaps that may form upon the fibers.
  • this technique has numerous draw backs. For example, a relatively large driving pressure is placed upon the gel in the reservoir to reduce air entrainment. Rapid application of barrier gel with this method requires relatively long and narrow application regions to prevent uncontrolled ejection of fluid from application regions, due to the large pressures.
  • an apparatus for applying gel to a plurality of optical fibers which substantially overcomes the above-recited drawbacks is highly desirable and needed in the optical fiber industry.
  • the present invention is directed to eliminating the above problems associated with the application of water barrier fluids, such as a gel, to optical fibers and optical fiber bundles.
  • water barrier fluids such as a gel
  • the invention improves the quality of the optical fiber cable and manufacturing process used to apply the gel.
  • the present invention addresses the above problems by providing a gel application apparatus that applies the gel with a flow having a high velocity in a direction normal to the surface of the optical fibers, as the fibers pass between an entrance die and an exit die. This creates a linear velocity great enough to overcome the kinetic energy of an air boundary layer traveling along with the fibers through the die entrance.
  • the method and apparatus is capable of accurately and efficiently coating optical fibers while eliminating unwanted air pockets.
  • the present invention relates to an apparatus for applying a coating of a water barrier fluid, such as a gel to an optical fiber
  • a die having an entrance side and exit side.
  • An orifice is formed in the die which extends through the entrance side and exit side in a width-wise direction, and which is dimensioned to allow for an optical fiber to be drawn therethough.
  • a cavity is formed in the die, and is in fluid communication with the orifice.
  • a fluid insertion opening is formed in the die for injecting fluid into the cavity. When a fluid is injected into the cavity it travels through the cavity and out of a circumferential exit gap, such that it coats a portion of the optical fiber.
  • the circumferential gap is formed at a meeting point between an inner portion of the cavity and the respective orifices of the entrance and the exit die.
  • the present invention still further provides for an apparatus for applying a coating to several optical fibers or a bundle of optical fibers, including an entrance die having an orifice which is dimensioned to allow for a bundle of optical fibers to be drawn therethrough. Also, an exit die having an orifice is provided. The entrance die and the exit die, respectively, have inner sides, which define a cavity. The cavity is in fluid communication with the orifice of the entrance die and the orifice of the exit die, such that a circumferential gap is formed at a meeting point between the cavity and the respective orifices of the entrance die and the exit die. Thus, the circumferential gap is radially surrounded by an extension of the cavity, to define a critical flow region.
  • a plurality of baffles are formed in the exit die, which are operative to inject fluid into the cavity. Also provided is a main body, which supports the entrance die and the exit die. The main body includes a passageway which is in fluid communication with the plurality of baffles. A retaining ring is also included, which secures the entrance die and the exit die to the main body.
  • the invention provides for a method of applying a water barrier fluid, such as a gel to one or more optical fibers, including the steps of drawing an optical fiber through an orifice formed in a die; and injecting a fluid into a cavity formed in the die, wherein the cavity is in fluid communication with the orifice, and wherein the fluid is pressurized out of the orifice and onto the optical fiber.
  • a water barrier fluid such as a gel
  • a plurality of optical fibers 10 are shown in a radial arrangement forming a fiber bundle 22.
  • twelve optical fibers 10 are shown; however, it will be appreciated that the optical fiber bundle 22 may consist of a varying arrangement and number of optical fibers 10.
  • the fiber bundle 22 is shown as having an outer portion 24 and an inner portion 26.
  • a water barrier fluid 28 for example, a thixotropic gel, is disposed onto the outer 24 and inner 26 portions of the fiber bundle 22, as described below.
  • the gel 28 acts to prevent ingress of water to the optical fiber surface produced from direct liquid contact or exposure to humid air.
  • thixotropic gel any of a broad classification of fluid polymeric materials may be used, provided that the materials meet the criteria of chemical compatibility with the optical fibers and their coatings, and that the water barrier fluid possess a chemical nature that materially limits the transport of water to the optical fiber surface.
  • suitable materials may include Newtonian liquids, dilute solutions containing polymer molecules, and liquid slurries containing solid particles, although not limited to such materials.
  • FIG. 2 and Figure 3 illustrate a die assembly 30 for forming the above cable.
  • the die assembly 30 includes a retaining ring 32 which is attached to a main body die 72. Positioned between the retaining ring 32 and the main body die 72, is an entrance die 42 and an exit die 54. These elements are operative to allow for optical fibers to pass through a center thereof.
  • the retaining ring 32 has an entrance side 34 and a containing side 36, which are in communication with each other.
  • the containing side 36 has a recessed area for accommodating the entrance die 42.
  • the retaining ring 32 also has an outer portion 40, which is threaded.
  • the entrance die 42 has an inner side 44, and an outer side 46.
  • the entrance die 42 may be made from a material, such as tungsten carbide.
  • the inner side 44 has a conical center portion 48 and is dimensioned so as to allow the entrance die 42 to be disposed within the recessed area 38 of the retaining ring 32 so that the outer side 46 of the entrance die 42 is in contact with a wall portion of the recessed area 38.
  • An orifice 50 is provided in the entrance die 42 and is centrally positioned in relation to the conical center portion 48.
  • the outer side 46 of the entrance die 42 has an inwardly tapered section which is angled towards the orifice 50.
  • the exit die 54 is provided with an inner side 56 and an outer side 58.
  • the exit die 54 may be made from a material, such as carbon steel.
  • the exit die 54 also has a centrally positioned orifice 60, which is concentrically positioned with respect to the orifice 50 of the entrance die 42.
  • the exit die 54 further contains a plurality of baffles or baffle holes 62, which are disposed around the orifice 60.
  • a cylindrically shaped spacer ring 64 is positioned between the entrance die 42 and the exit die 54.
  • the spacer ring 64 is operative to position the entrance die 42 and the exit die 54 at predetermined relationship with respect to each other.
  • the spacer ring 64 is dimensioned to contact wall portions of the entrance and exit dies 42 and 54, so as not to interfere with the plurality of baffles 62 and orifice 60 of the exit die 54, and orifice 50 of the entrance die 42.
  • the contiguous positioning of the entrance and exit dies 42 and 54 form a fluid cavity 66, as shown in Figures 3 and 4.
  • the fluid cavity 66 is defined by the conical center portion 48 of the entrance die 42 and the inner side 56 of the exit die 54.
  • the fluid cavity 66 extends circumferentially around, and is in communication with, the orifice 50 of the entrance die 42 and the orifice 60 of the exit die 54, thus producing an exit gap G, having a dimension d 1 .
  • the exit gap G forms an integral part of a critical flow region 69.
  • the critical flow region 69 is further defined by dimensions d 2 and d 3, which respectively represent the orifice diameters of the entrance die 42 and the exit die 54.
  • the barrier fluid must not be materially disturbed by air that is naturally accelerated toward the die by the approaching fibers.
  • the present invention sizes the critical flow region such that the kinetic energy of the barrier fluid that passes through the exit gap G and contacts the fibers is large in comparison to the air accelerated toward the die entrance by the moving fibers.
  • the upper limit for the dimensions of the critical flow region is chosen such that the kinetic energy of the barrier fluid is larger, for example on the order of several hundred times that, of the potentially entrained air.
  • the lower limit for the dimensions of the critical flow region is constrained by the need to apply the barrier fluid at pressures readily supplied by inexpensive process fluid handling equipment.
  • Also taken into consideration when determining the dimensions of the critical flow region is the desired fiber bundle geometry, as required by the cable product.
  • An exemplary embodiment of gap dimensions which have been shown to produce favorable results include an entrance die diameter d 2 and an exit die diameter d 3 of 1.04 mm, and a gap G width d 1 of 0.5 mm. During testing, such dimensions have resulted in a kinetic power of an extrudate of 4.94 Watts.
  • a slip ring 70 is provided around an outer circumferential surface of both the entrance 42 and exit 54 die.
  • the slip ring 70 forms a slip fit with the dies and is operative to aid in keeping the dies properly aligned.
  • the main die body 72 has a first recessed portion 74, for receiving the exit die 54, the spacer ring 64 and the entrance die 42.
  • the recessed portion 74 has a first diameter which is dimensioned to form a proper fit with the slip ring 70.
  • the main die body 72 also has a second recessed portion 75 with threads formed thereon, for engaging with the outer threaded portion 40 of the retaining ring 32. Accordingly, when the retaining ring 32 is threadedly engaged with the main die body 72, the entrance die 42, the spacer ring 64, the exit die 54 and the slip ring 70 are secured together to form the die assembly 30.
  • the main die body 72 also has a conical side 78 which is angled in towards a center portion of the die main body 72. It is also noted that the conical design is given by way of example, and that this side may be formed to be flat in shape.
  • An orifice 80 is provided in the main die body 72 which is centrally positioned with respect to the conical side 78, so as to be in communication with the orifice 60 of the exit die 54 and the orifice 50 of the entrance die 42.
  • an o-ring 82 as shown in Figure 3, is provided between the retaining ring 32 and the entrance die 42.
  • an o-ring 84 is provided between the exit die 54 and the die main body 72.
  • the o-rings may be made from a material, such as nitrile rubber.
  • An injection port 86 is provided on an outer portion of the main body 72.
  • a cavity 87 which may be annular, is formed to be in communication with the injection port 86, and abuts baffle holes 62. It will also be appreciated that the injection port 86 may be placed in the conical side 78 of the main body 72.
  • the injection port 86 is formed to be in communication with the baffles 62 of the exit die 54.
  • the injection port 86 is also connected to a pumping system, which is operative to supply the gel in a pressurized state and is capable of providing a sufficient quantity of fluid at uniform rates to produce the desired amount to be combined with the group of optical fibers, which is passed therethrough.
  • the bundle of optical fibers 22 are fed into the die assembly 30 through the entrance side 34 of the retaining ring 32 and into the entrance die 42.
  • the bundle of fibers 22 is then drawn through to the exit die 54, while passing the critical flow region 69.
  • the bundle 22 is then drawn through the outer side 58 of the exit die 54, and out of the die assembly 30.
  • the present invention can also be implemented to coat an individual optical fiber, as well as the described optical fiber bundle 22.
  • the coating of the optical fiber bundle 22 is accomplished by pressurizing gel into the injection port 86 of the main body 72 and through the cavity 87.
  • the pressurized gel then travels into the fluid cavity 66, which is formed between the entrance and exit dies 42 and 54.
  • the shape of the fluid cavity 66 is chosen to have a section wide enough such that resistance to filling of the cavity is small, and varies smoothly, such that flow-induced shear stress on the gel is gradually increased toward the exit gap G.
  • the pressurized gel is ejected into the critical flow 69 region via the exit gap G and onto the bundle of fibers 22.
  • the orifice 50 of the entrance die 42 has a dimension d 2 so as to slightly compress the original diameter of the bundle of fibers 22.
  • an exemplary size of d 2 is 1.04 mm and is chosen to compact the individual optical fibers 10 of the bundle 22, towards each other such that excess air is removed from the bundle 22 and the fiber group attains the degree of compaction required by the cable manufacturing process.
  • the gel 28 upon the pressurizing of the gel 28 onto the bundle 22, the gel 28 not only coats the outer portion of the bundle 24, but is also forced into the inner portion 26 of the bundle 22.
  • the gel 28 is applied by controlling the volumetric flow rate and pressure. For example, for a flow rate of about 57,000 mm 3 per minute of gel, cavity pressure of 48,000 Pascal was measured while applying gel on a bundle of 12 fibers.
  • the gel 28 is applied at a high flow rate or velocity in a direction normal to the surface of the optical fibers as the fibers pass between the entrance die 42 and an exit die 54.
  • a mean gel velocity, normal to the fiber bundle in the gap, of 13,000 mm per minute may be used. This creates a linear velocity great enough to overcome the kinetic energy of an air boundary layer traveling along with the fibers toward the die entrance. This is because the kinetic power of the extruded gel is much larger than the boundary layer of air around the bundle of fibers 22.
  • the method and apparatus is capable of accurately and efficiently combing fluids with optical fibers while eliminating unwanted air pockets.
  • the invention describes the use of a plurality of baffles in the exit die, and an injection port in the main die body, it will be appreciated that a plurality of injection ports may be used, and that the size and shape of the baffles and the injection port may be altered depending on the type of gel used, the shape of the cavity and the rate at which the fibers are drawn through the die assembly.
  • the invention describes the use of a conical region formed on the entrance die for creating a particular shaped cavity, it will be appreciated that various configurations of the inner side of the entrance die, and the inner side of the exit die may be used to obtain various shaped cavities depending on the desired flow behavior of the gel.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Surface Treatment Of Glass Fibres Or Filaments (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)
EP02017827A 2001-09-06 2002-08-08 Vorrichtung zur Kombinierung einer Flüssigkeit mit einer optischen Faser oder mit optischem Faserbündel Expired - Lifetime EP1291332B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US946466 2001-09-06
US09/946,466 US7045010B2 (en) 2001-09-06 2001-09-06 Applicator for high-speed gel buffering of flextube optical fiber bundles

Publications (3)

Publication Number Publication Date
EP1291332A2 true EP1291332A2 (de) 2003-03-12
EP1291332A3 EP1291332A3 (de) 2004-02-11
EP1291332B1 EP1291332B1 (de) 2011-06-22

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EP02017827A Expired - Lifetime EP1291332B1 (de) 2001-09-06 2002-08-08 Vorrichtung zur Kombinierung einer Flüssigkeit mit einer optischen Faser oder mit optischem Faserbündel

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US (2) US7045010B2 (de)
EP (1) EP1291332B1 (de)
AT (1) ATE513796T1 (de)
ES (1) ES2367980T3 (de)

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US20030044135A1 (en) 2003-03-06
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US7045010B2 (en) 2006-05-16
ATE513796T1 (de) 2011-07-15
EP1291332B1 (de) 2011-06-22

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